What is a KEY file?

Typically created upon registering legal software copies, the file may be applied by different programs. It comes in a plain text format. The file may store an encrypted key string, which allows authenticating the purchase as well as registering the software.

How to open KEY file?

Double click the key file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .key extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the key file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open KEY files

Windows

Used by various programs

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the key file as well. Download Universal File Viewer for your OS.